This book merits four and a half stars, but I rounded down to four. The book is excellent and filled with information and opposing theological strains within Islam. However, I felt that sometimes Esposito tried to defend Islam from Western critique (which I have no problem with in of itself) but would later write about certain tenets in Islam that kind of disproved the points he was trying to make. For instance, the question of "why did the Arabian Muslims seek to expand" never felt adequately answered. Esposito himself notes that researchers have not been able to agree on that matter. And yet I feel like he expended so much energy on why the Arab invaders were not a bad force, etc, while describing their erosion of the Sasanid Empire and spread into Asia.
Other than that grievance, this book was by far the best book offered in my theology class. As noted previously, different theological viewpoints were given in a clear and succinct way. This made essay writing on Islam easy and, frankly, fun. This book is the only book in my course literature that I do not want to sell. I feel like this book will be relevant as long as "Islamophobia" (ie, overblown fear of Islamic terrorism and general European xenophobia) exists.